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在水流问题中涉及到许多已知量和未知量,因而不易找出等量关系,若采用多设未知数的方法便可方便地列出方程来求解。这里多设的未知数称为“增元”或“辅助未知数”。例1 一艘轮船从A港到B港顺水航行需6小时,从B港到A港逆水航行需8小时。若在静水条件下,从A港到B港需( )。 (A)7小时 (B)6(6/7)小时 (C)7(1/2)小时 (D)6(1/6)小时 (1990年武汉、重庆、广州、洛阳、福州联赛题) 解设船在静水条件下,从A港到B港需x小时,两港之距为s千米。
Many known quantities and unknown quantities are involved in the water flow problem, so it is not easy to find equal relationships. If multiple unknowns are used, the equations can be conveniently listed for solving. The unknowns set here are called “growths” or “auxiliary unknowns.” Example 1 It takes 6 hours for a ship to sail from A Port to B Harbor and it takes 8 hours to cross from B Harbor to A Harbor. If you are in still water conditions, you need to (A) from Port A to Port B. (A) 7 hours (B) 6 (6/7) hours (C) 7 (1/2) hours (D) 6 (1/6) hours (1990 Wuhan, Chongqing, Guangzhou, Luoyang, Fuzhou League title) Settlement boats are required to be x hours from A port to B port under calm water conditions. The distance between the two ports is s kilometers.